UV digital inkjet printing has become a popular surface decoration method for wood-based furniture due to its high efficiency and environmental friendliness. However, the bonding interface between the UV coating and wood surface is weak and results in poor printing durability. In this study, birch wood surfaces were treated with three silane coupling agents, namely γ-methacryloxypropyl trimethoxy silane (KH570), triethoxy vinyl silane (KH151) and 3-glycidyloxypropyl trimethoxy silane (KH560), to improve surface bonding efficiency with UV coating. After saline treatments, the water contact angle of the wood substrates increased from 58° to greater than 100°. The bonding strengths between the UV coating and wood surface treated with 200 g/m 2 KH570, KH151 and KH560 were enhanced to 5.91 MPa, 5.42 MPa and 1.88 MPa, respectively, comparing with the untreated sample of 1.3 MPa. FTIR results indicated that all silane coupling agents could be grafted onto the wood fibers at the substrate surface and KH570 was able to participate in UV curing process. SEM imaging showed that a layer of KH570 was tightly attached to the wood substrate surface and seamlessly connected to the UV coating, thus the adhesion of UV ink was greatly improved.
Li Hailong,Chen Xindong,Wang Can,Chen Xuefang,Guo Haijun,Xiong Lian,Zhang Hairong,Huang Chao,Chen Xinde
Understanding factors that affect the catalytic efficiency and synergism of enzymes is helpful to enhance the process of bioconversion. In this study, birch wood (BW) was sequentially treated by delignification (DL), deacetylation (DA), and decrystallization (DC) treatments. The physiochemical structures of treated BW were characterized. Moreover, the influences of sequential treatments on the catalytic efficiency and synergism of xylanase and cellulase were studied. DL treatments efficiently improved the conversion of cellulose and xylan. A high degree of synergy (DS) between xylanase and cellulase was produced during hydrolysis of DL-treated BW. DA treatments enhanced xylan conversion but reduced the DS between xylanase and cellulase for xylan hydrolysis, whereas DC treatments enhanced cellulose conversion but reduced the DS between xylanase and cellulase for cellulose hydrolysis. The cellulose conversion of lithium chloride/N,N-dimethylacetamide (LiCl/DMAc)-treated BW (89.69%) was higher than the cellulose conversion of ball milling (BM)-treated BW (81.63%), whereas the xylan conversion of LiCl/DMAc-treated BW (83.77%) was lower than the xylan conversion of BM-treated BW (87.21%). This study showed that the catalytic efficiency and synergism of xylanase and cellulase are markedly affected by lignin hindrance, hemicellulose acetylation, and cellulose crystallization. Graphical abstract
危险品化学品经营许可证（带存储）